X-Symbol: The main purpose of package x-symbol
is to provide some WYSIWYGness in an area where it greatly
enhance the readability of your LaTeX or HTML source: using
"real" characters for "tokens" like \oplus or
&#8482;. It also provides input methods for
these characters, both for the beginner and the expert (some
users regard this as the main reason to use package
x-symbol). WYSIWYG super- and subscripts and images/figures are
also supported.